Plumb and level.



No. 824,985. PATENTED JULY 3, 190a. J. J. GREENE. PLUMB AND LEVEL.

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UNITED STATES PATENT OFFICE.

Specification of Letters Patent.

Patented July 3, 1906.

A ucgti m October 25,1905. Serial No. 284,862.

To all whom it may concern.-

Be it known that I, JAMES JACKSON GREENE, a citizen of the UnitedStates, residing at Memphis, in the county of Shelby and State ofTennessee, have invented a new and useful Improvement in a Plumb andLevel, of which the following is a specification.

This invention relates to a plumb and level adapted for use indetermining various angles; and the object of the invention is toprovide a straight-edge piece with a level which can be swun upon apivot-point along a graduated sczfie and which is held by springpressureat any point along the said scale and which is automatically lockedagainst movement over the ends of the scale.

The invention also consists of the novel features of constructionhereinafter set forth, pointed out in the claims, and shown in theaccompanying drawings, in which Figure 1 is a perspective view of aportion of a straight-edge piece having my improved leveling device inposition thereon. Fig. 2 is a side elevation of a portion of astraight-edge block and my level. Fig. 3 is alongitudinal sectionthrough the parts shown in Fig. 2.

In the drawings, A represents a straightedge block upon one face ofwhich is secured a quadrant B, having a suitable scale B laid ofi'adjacent its curved edge.

The leveling device consists of a tube C open at each end and which atone end has a fiat extension C, which extension is pivotally mountedupon a mill-headed screw 0 which screw passes through a corner portionof the quadrant B and works in a threaded socket A, formed in thestraight-edge A. A coil-spring C is interposed between the head of thescrew and the fiat extension 0 and bears downwardly upon the latter,holding it firmly in contact with the quadrant B. The tension of thespring C can be regulated by turning the screw. The tube C is providedadjacent the end opposite the extension 0 with a plurality of openings0* and adjacent this end is threaded, and a tube D, also threaded, isscrewed over the threaded end of the tube 0. In these tubes is arrangeda glass bulb E, which contains the fluid usually found in sight orleveling instruments.

The free end of the tube D is provided with a pin D, which travels alongthe edge of the scale B, and at each end of the scale sockets B areformed in the faces of the quadrant into which the pin D drops as itreaches the ends of the scale, thereby preventing it from beingaccidentally moved off of the quadrant B.

The bulb E is of slightly less diameter than the tube C and is held inposition by means of suitable washers or packing-rings E.

By having a plurality of openings 0 arranged circumferentially in thetube C the level can be used in a position above the level of the eyesas when viewed from below. Two of the said openings will be brought intoalinement, and the air-space in the bulb E can be clearly seen betweenthe two alining openings when the tubes are brought into a horizontalplane.

It will be obvious that by making the instrument of two tubes threadedtogether it can be lengthened or shortened, so that the pin D willalways travel in an are which will throw the pin in the proper positionupon the scale and in the socket B when moved to the ends of the scale.

The advantages and manner of using the instrument will be apparent tothose skilled in handling such devices.

Having thus fully described my invention, what I claim as new, anddesire to secure by Letters Patent, is I 1. The combination with aquadrant having a scale thereon, a tube having a flat extension at oneend, a screw working through the quadrant and passing loosely throughthe said extension, a spring encircling the screw and bearing upon thesaid extension, a second tube carried by the tube first mentioned, andadjustable thereon, a pin carried by the second-mentioned tube adaptedto travel upon the scale and a glass bulb carried by the first tube.

2. A device of the kind described comprising a quadrant having a scalethereon, sockets adjacent to the ends of the scale, a pivoted tubemovable upon the scale, a second tube threaded upon the pivoted tube andhaving a pin adapted to engage the sockets, and a sight-bulb carriedwithin the tubes, one of said tubes having a plurality ofcircumferentially-arranged openings therein.

3'. A device of the kind described. comprising a quadrant havin a scalethereon, and having sockets formec adjacent to the ends of the scale,tubes threaded together, one of said tubes having si ht-openingstherein, a ets at the ends of the scale, and a sight-bulb fliatextengion, carrief by the free end of one held in position Within thesaid tubes.

0 said tu es means or pivoting said extension to the uadrant, a springadapted to JACKSON GREENE 5 bear upon sai extension a pin carried by theWitnesses:

free end of the other tube, and adapted to JOHN H. GREENE,

travel upon the scale and to engage the sock- E. HITCH.

